Efficient and Clean Catalytic Hydrogenolysis of Aromatic Ketones by Silica Supported Schiff Base Modify Chitosan-Palladium Catalyst

Abstract

An silica supported chitosan-Schiff base Pd(II) catalyst was prepared in a simple way and characterized by XRD, FT-IR, SEM-EDS, XPS and TG, and the ability of this complex to catalyze hydrogenolysis of 1-tetralone into 1,2,3,4-tetrahydronaphthalene was also investigated in the presence of hydrogen. It has been revealed that the catalyst had high catalytic activity for hydrogenolysis of 1-tetralone at ambient temperature and normal pressure of hydrogen. Especially, the hydrogenolysis of 1-tetralone in ethanol solvent gave excellent results and the 100% conversion of 1-tetralone and the 100% selectivity for 1,2,3,4-tetrahydronaphthalene were obtained under optimized reaction conditions. The influences of reaction temperature, reaction time and solvent on the hydrogenolysis of 1-tetralone were also investigated. It has been also revealed that the catalyst was efficient and eco-friendly for the hydrogenolysis of carbonyl that connected with a benzene ring to give corresponding aromatic hydrocarbons.

Catalytic Methylation of CH Bonds Using CO2 and H2

“…This outcome is in agreement with a recent report by Klankermayer, Leitner, and coworkers, who describe the formation of 2 a. [15,16] Along with this discovery, we studied the methylation of 2-methyl indole (1 b) to suppress unwanted side-reactions (Table 1; see Table S1 in the Supporting Information). [13] It seems probable that the carbon atom of -CH 2 -in 4 a should come from CO 2 .…”

Catalytic Methylation of CH Bonds Using CO2 and H2

“…[14] This result implies that CO 2 and hydrogen can be used as a formaldehyde surrogate, further indicating the possibility of utilizing CO 2 , by way of formaldehyde, for the methylation of C À H bonds. [15,16] Along with this discovery, we studied the methylation of 2-methyl indole (1 b) to suppress unwanted side-reactions (Table 1; see Table S1 in the Supporting Information). [14] Indeed, the desired methylated product 3 b was obtained as a major product with the reduction/N-methylation product 1,2-dimethyl indoline (2 b) as a minor one.…”

Synthesis and Spectral Investigation of Co(II), Ni(II), Cu(II) and Zn(II) Complexes with Novel N4 Ligands

“…Among different types of ligands that influence the chemistry of transition metals and modify their spectral, catalytic and biological properties, the Schiff bases occupy a special place [7][8][9][10][11][12][13]. The Schiff bases, which contain imine (>C=N-) functional group afford potential sites for bio-chemically active compounds that are related to intermolecular hydrogen bonding and proton transfer equilibria [14].…”